diff --git a/interface/CMakeLists.txt b/interface/CMakeLists.txt
index 3e8a6ef92d..b4ce53b92a 100644
--- a/interface/CMakeLists.txt
+++ b/interface/CMakeLists.txt
@@ -2,7 +2,7 @@ set(TARGET_NAME interface)
 project(${TARGET_NAME})
 
 # set a default root dir for each of our optional externals if it was not passed
-#set(OPTIONAL_EXTERNALS "LeapMotion")
+set(OPTIONAL_EXTERNALS "LeapMotion")
 
 if(WIN32)
     list(APPEND OPTIONAL_EXTERNALS "3DConnexionClient")